Westfall



(No Model.) v 2 Sheets Sheet 1..

`G. W. SHAMP. ROTARY PUMP. i

No. 283,153. Patented Aug. 14, 1888.

WM 1 m N. Pneus. Pmmumawpm, wmingm. n. c;

(No Model.) 2 sheets-sheet 2. G. W. SHAMP.

2 ROTARY PUMP. No. 288,158. Patented Aug. 14, 1888.

Zess'es: lwhew/W Y (//fe/ N. PETERS. Phawmmgmphu. wnnington. D. C.

GEORGE w.

PATENT OFFICE.

SHAMP, OF BUFFALO, NEW YORK, ASSIGNOR TO AUGUSTUS M.

WESTFALLAND EDGAR A. GAY, OF SAME PLACE.

RQTARYPUMP.

SPECIFICATION forming 'part of Letters Patent No. 283,153, dated August 14, 18,83.

Application filed December 13, 1882.

and to letters or figures of reference marked thereon,which form a part of this specification.

My invention relates more particularly to certain improvements in the rotary pump for which Letters Patent No.` 263, 97 5 were granted on the th day of September, 1882, to A. `Siegrist. Such pump consists, essentially, of a cylinder provided with a single stationary abut` ment and winged pistons, which are seated in a rotating hub, and which are capable of rotary movement intheir seats in the hub.

s `My improved construction consists, substantially, in providing theeylinder with two stationary abutments located at a distance apart greater than the width of the piston-recess in the hub, so that while one ofthe stationary abutments loses contact with the outer surface of the i rotating hub as the piston-recess is passing such abutment, a close contact is preserved between theother stationary abutment and the outer surface of the rotating hub,whereby the suction-power principally isfgreatly increased,

` all as will be more fullyhereinafter described.

In the drawings,Figure l is avertical crosssection of my improved pump. Fig. 2 is a longitudinal section of the same, taken in the line a: m of Fig. l; and Fig. 3 is an end elevation with the cylindrical cover removed.

Referring to the drawings, a is the cylinder, b b the cylinder-covers, and yc the shaft.`

d is the hub, which is secured to the shaft c, and e e are two disks or circular heads, secured to both ends of the hub d by screw-bolts cl; and d2 d? are dowel-pins upon the hub d, which project into openings formed in the heads e c, and serve as additional means of security for the heads e e. s i

:ff are rotary pistons arranged in recesses d (No model.)

ofthe hub d, between the heads e e thereof, and provided with pivots j", which turn in bearings in the heads e c. These pistons are feach provided with wings f2, some of which bear against the inner surface of the cylinder and some against the concave surface of the recess cl3, in which the piston is located. The.

illustrated by dotted lines in Fig. 3,' the cen tral portion, g, bearing against the concave surface of the recess d3 in the hub d and the end portions, g g', against the inner surface of the cylinder during the operation of the pump.

The parts of the pump just described are in substance the same as those shown and described in the -patent hereinbefore named, wherein the winged piston is turned by a sin gle stationary abutment located midway between the inlet and outlet ports, a close contact between such abutment and the surface o f the recess between the two abutting wings of the piston being maintained while the piston is` passing the single abutment. I-have found by experiment that for forcing water this construction is amply sufficient foi` ordinary purposes, but in raising water to any substantial distance by the force of suction it fails to meet the requirements, for the reason that there is more or less lescape prejudicial to the suctionpower during the time that the outer surface of the hub loses contact with the abutment while the piston-recess is 4passing such abutment. In order to overcome this difficulty, and

thereby materially increase the suction-power f 4centric with the axis of the hub, and are made to fit closely thereon during such contact. These abutments h and 7L are not intended to fit closely in the recesses f 3 between the wings Io through inlet-port k, and is forcing the water ofthe piston7 as in the patent hereinbefore named7 but are so constructed as to allow the piston to turn loosely and easily as it passes the abutment.

Ihe operation of my improved pump is as follows: The shaft c is revolved in the direction of the arrow in Fig. 1, and the top piston is shown as having just passed the abutment h and approaching the abutment 7L. The lower piston in its travel is producing a suction in front of it out through the port 7c. At the instant that the top piston clears the abutment h the surface d? of the hub comes in contact `piston As the upper piston moves out from between the abutments h and h and the surface d* prevents the water in such space from passing backward toward the abutment L, the displacement of the piston has the effect of producing a partial vacuum in such space, thereby tending to increase the suction already started by the lower piston in its travel to- 3o ward the outlet-port k.

It will be noticed that in my improved construction there is always a close and effective contact between one of the two abutments and the hub while the piston is passing either. of 35 such abutments, thereby furnishing a practically-uninterrupted air and water tight passage for the travel of the piston or pistons from the inlet to the outlet port.

It is apparent that my improved pump is 4o equally well adapted for use as arotary engine.

I claim- In a rotary pump, the'combination; with a rotary hub, d, provided with recesses d3 and rotary pistons f, attached to the hub andpro- 45y vided with wings f 2, ofthe cylinder a, provided with the inlet and outlet ports 7c lc and the two stationary abutments h and h, located at a distance apart greater than the width of the recess df in the `hub d; all arranged and operat- 5o ing substantially as shown and described.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

' GEORGE XV'. SHAMP. Vitnesses: y

A. M. WESTFALL, W. T. MILLER. 

